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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 11)

Which of these expression is a perfect square trinomial?
x² + 2x + 1
x² + 2x - 1
x² - 4x + 6
x² - 1

Explanation

x² + 2x + 1 can be written as (x+1)²

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